Add IgnoreIf attribute to only run SDC tests on Windows

FFMpegCore.Test/AudioTest.cs

@@ -11,6 +11,7 @@
 using System.Runtime.Versioning;
 using System.Threading.Tasks;
 using FFMpegCore.Extensions.System.Drawing.Common;
+using FFMpegCore.Test.Utilities;
 
 namespace FFMpegCore.Test
 {
@@ -66,8 +67,8 @@ public void Audio_Add()
             Assert.IsTrue(File.Exists(outputFile));
         }
 
-        [TestMethod]
+        [TestMethodWithIgnoreIfSupport]
-        [SupportedOSPlatform("windows")]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Image_AddAudio()
         {
             using var outputFile = new TemporaryFile("out.mp4");

FFMpegCore.Test/Utilities/IgnoreIfAttribute.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Reflection;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace FFMpegCore.Test.Utilities;
+
+// https://matt.kotsenas.com/posts/ignoreif-mstest
+/// <summary>
+/// An extension to the [Ignore] attribute. Instead of using test lists / test categories to conditionally
+/// skip tests, allow a [TestClass] or [TestMethod] to specify a method to run. If the method returns
+/// `true` the test method will be skipped. The "ignore criteria" method must be `static`, return a single
+/// `bool` value, and not accept any parameters. By default, it is named "IgnoreIf".
+/// </summary>
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+public class IgnoreIfAttribute : Attribute
+{
+    public string IgnoreCriteriaMethodName { get; set; }
+
+    public IgnoreIfAttribute(string ignoreCriteriaMethodName = "IgnoreIf")
+    {
+        IgnoreCriteriaMethodName = ignoreCriteriaMethodName;
+    }
+
+    internal bool ShouldIgnore(ITestMethod testMethod)
+    {
+        try
+        {
+            // Search for the method specified by name in this class or any parent classes.
+            var searchFlags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy | BindingFlags.Static;
+            var method = testMethod.MethodInfo.DeclaringType!.GetMethod(IgnoreCriteriaMethodName, searchFlags);
+            return (bool) method?.Invoke(null, null)!;
+        }
+        catch (Exception e)
+        {
+            var message = $"Conditional ignore method {IgnoreCriteriaMethodName} not found. Ensure the method is in the same class as the test method, marked as `static`, returns a `bool`, and doesn't accept any parameters.";
+            throw new ArgumentException(message, e);
+        }
+    }
+}

FFMpegCore.Test/Utilities/OperatingSystemUtils.cs

@@ -0,0 +1,11 @@
+using System.Runtime.InteropServices;
+
+namespace FFMpegCore.Test.Utilities;
+
+public static class OperatingSystemUtils
+{
+    public static bool NotWindows()
+    {
+        return !RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
+    }
+}

FFMpegCore.Test/Utilities/TestMethodWithIgnoreIfSupportAttribute.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace FFMpegCore.Test.Utilities;
+
+// https://matt.kotsenas.com/posts/ignoreif-mstest
+/// <summary>
+/// An extension to the [TestMethod] attribute. It walks the method and class hierarchy looking
+/// for an [IgnoreIf] attribute. If one or more are found, they are each evaluated, if the attribute
+/// returns `true`, evaluation is short-circuited, and the test method is skipped.
+/// </summary>
+public class TestMethodWithIgnoreIfSupportAttribute : TestMethodAttribute
+{
+    public override TestResult[] Execute(ITestMethod testMethod)
+    {
+        var ignoreResults = TestMethodUtils.GetIgnoreResults(testMethod);
+        return ignoreResults.Any() 
+            ? ignoreResults 
+            : base.Execute(testMethod);
+    }
+}
+public class DataTestMethodWithIgnoreIfSupportAttribute : DataTestMethodAttribute
+{
+    public override TestResult[] Execute(ITestMethod testMethod)
+    {
+        var ignoreResults = TestMethodUtils.GetIgnoreResults(testMethod);
+        return ignoreResults.Any() 
+            ? ignoreResults 
+            : base.Execute(testMethod);
+    }
+}
+
+internal class TestMethodUtils
+{
+    internal static TestResult[] GetIgnoreResults(ITestMethod testMethod)
+    {
+        var ignoreAttributes = FindAttributes(testMethod);
+
+        // Evaluate each attribute, and skip if one returns `true`
+        foreach (var ignoreAttribute in ignoreAttributes)
+        {
+            if (ignoreAttribute.ShouldIgnore(testMethod))
+            {
+                var message = $"Test not executed. Conditional ignore method '{ignoreAttribute.IgnoreCriteriaMethodName}' evaluated to 'true'.";
+                {
+                    return new[]
+                    {
+                        new TestResult { Outcome = UnitTestOutcome.Inconclusive, TestFailureException = new AssertInconclusiveException(message) }
+                    };
+                }
+            }
+        }
+
+        return Array.Empty<TestResult>();
+    }
+
+    private static IEnumerable<IgnoreIfAttribute> FindAttributes(ITestMethod testMethod)
+    {
+        // Look for an [IgnoreIf] on the method, including any virtuals this method overrides
+        var ignoreAttributes = new List<IgnoreIfAttribute>();
+        ignoreAttributes.AddRange(testMethod.GetAttributes<IgnoreIfAttribute>(inherit: true));
+
+        // Walk the class hierarchy looking for an [IgnoreIf] attribute
+        var type = testMethod.MethodInfo.DeclaringType;
+        while (type != null)
+        {
+            ignoreAttributes.AddRange(type.GetCustomAttributes<IgnoreIfAttribute>(inherit: true));
+            type = type.DeclaringType;
+        }
+        return ignoreAttributes;
+    }
+}

FFMpegCore.Test/VideoTest.cs

@@ -10,10 +10,12 @@
 using System.Drawing.Imaging;
 using System.IO;
 using System.Linq;
+using System.Runtime.Versioning;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using FFMpegCore.Extensions.System.Drawing.Common;
+using FFMpegCore.Test.Utilities;
 
 namespace FFMpegCore.Test
 {
@@ -86,7 +88,9 @@ public void Video_ToH265_MKV_Args()
             Assert.IsTrue(success);
         }
 
-        [DataTestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [DataTestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format24bppRgb)]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format32bppArgb)]
         public void Video_ToMP4_Args_Pipe(System.Drawing.Imaging.PixelFormat pixelFormat)
@@ -102,7 +106,9 @@ public void Video_ToMP4_Args_Pipe(System.Drawing.Imaging.PixelFormat pixelFormat
             Assert.IsTrue(success);
         }
 
-        [TestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Video_ToMP4_Args_Pipe_DifferentImageSizes()
         {
             using var outputFile = new TemporaryFile($"out{VideoType.Mp4.Extension}");
@@ -121,8 +127,9 @@ public void Video_ToMP4_Args_Pipe_DifferentImageSizes()
               .ProcessSynchronously());
         }
 
-
+        [SupportedOSPlatform("windows")]
-        [TestMethod, Timeout(10000)]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)][SupportedOSPlatform("windows")]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public async Task Video_ToMP4_Args_Pipe_DifferentImageSizes_Async()
         {
             using var outputFile = new TemporaryFile($"out{VideoType.Mp4.Extension}");
@@ -141,7 +148,9 @@ public async Task Video_ToMP4_Args_Pipe_DifferentImageSizes_Async()
               .ProcessAsynchronously());
         }
 
-        [TestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Video_ToMP4_Args_Pipe_DifferentPixelFormats()
         {
             using var outputFile = new TemporaryFile($"out{VideoType.Mp4.Extension}");
@@ -160,8 +169,9 @@ public void Video_ToMP4_Args_Pipe_DifferentPixelFormats()
               .ProcessSynchronously());
         }
         
-
+        [SupportedOSPlatform("windows")]
-        [TestMethod, Timeout(10000)]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public async Task Video_ToMP4_Args_Pipe_DifferentPixelFormats_Async()
         {
             using var outputFile = new TemporaryFile($"out{VideoType.Mp4.Extension}");
@@ -315,7 +325,9 @@ public void Video_ToTS_Args()
             Assert.IsTrue(success);
         }
 
-        [DataTestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [DataTestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format24bppRgb)]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format32bppArgb)]
         public async Task Video_ToTS_Args_Pipe(System.Drawing.Imaging.PixelFormat pixelFormat)
@@ -347,7 +359,9 @@ public async Task Video_ToOGV_Resize()
             Assert.IsTrue(success);
         }
 
-        [DataTestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [DataTestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format24bppRgb)]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format32bppArgb)]
         // [DataRow(PixelFormat.Format48bppRgb)]
@@ -382,7 +396,9 @@ public void Scale_Mp4_Multithreaded()
             Assert.IsTrue(success);
         }
 
-        [DataTestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [DataTestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format24bppRgb)]
         [DataRow(System.Drawing.Imaging.PixelFormat.Format32bppArgb)]
         // [DataRow(PixelFormat.Format48bppRgb)]
@@ -399,7 +415,9 @@ public void Video_ToMP4_Resize_Args_Pipe(System.Drawing.Imaging.PixelFormat pixe
             Assert.IsTrue(success);
         }
 
-        [TestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Video_Snapshot_InMemory()
         {
             var input = FFProbe.Analyse(TestResources.Mp4Video);
@@ -410,7 +428,9 @@ public void Video_Snapshot_InMemory()
             Assert.AreEqual(bitmap.RawFormat, ImageFormat.Png);
         }
 
-        [TestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Video_Snapshot_PersistSnapshot()
         {
             var outputPath = new TemporaryFile("out.png");
@@ -446,7 +466,8 @@ public void Video_Join()
             Assert.AreEqual(input.PrimaryVideoStream.Width, result.PrimaryVideoStream.Width);
         }
 
-        [TestMethod, Timeout(10000)]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Video_Join_Image_Sequence()
         {
             var imageSet = new List<ImageInfo>();
@@ -555,7 +576,9 @@ public void Video_OutputsData()
             Assert.IsTrue(File.Exists(outputFile));
         }
 
-        [TestMethod, Timeout(10000)]
+        [SupportedOSPlatform("windows")]
+        [TestMethodWithIgnoreIfSupport, Timeout(10000)]
+        [IgnoreIf(nameof(OperatingSystemUtils.NotWindows))]
         public void Video_TranscodeInMemory()
         {
             using var resStream = new MemoryStream();